The Environment: Learning from Bad Ideas Series, Mary Colson, pp. 50, Heinemann-Raintree Library, 2010, ISBN 978-1-4109-3912-8, ... These possums soon escaped into the wild, where they have thrived as an invasive species. In 2009 there were estimated to be around 70 million possums. There are no native predators of the possum in New Zealand ...
